[jboss-jira] [JBoss JIRA] (DROOLS-4805) Memory leak in STREAM mode (# PointInTimeTriggers growing)

[Jesse White (Jira)]

Jesse White created DROOLS-4805:
-----------------------------------

             Summary: Memory leak in STREAM mode (# PointInTimeTriggers growing)
                 Key: DROOLS-4805
                 URL: https://issues.jboss.org/browse/DROOLS-4805
             Project: Drools
          Issue Type: Bug
    Affects Versions: 7.29.0.Final
            Reporter: Jesse White
            Assignee: Mario Fusco
         Attachments: image-2019-11-25-10-31-07-281.png

When running our engine in STREAM mode, we notice a number of Drools internal object references increasing time even though the fact count stays relatively constant.

jmap -histo <pid> shows:
{noformat}

 num     #instances         #bytes  class name
----------------------------------------------
   1:      17478466     1258449552  java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask
   2:      17475174      699006960  org.drools.core.time.impl.JDKTimerService$JDKJobHandle
   3:      17762331      568394592  java.util.concurrent.ConcurrentHashMap$Node
   4:      17475174      559205568  org.drools.core.rule.SlidingTimeWindow$BehaviorJobContext
   5:      17475174      559205568  org.drools.core.time.impl.DefaultTimerJobInstance
   6:       8596776      551411680  [C
   7:      18898675      453568200  java.lang.Long
   8:      17475174      419404176  org.drools.core.time.SelfRemovalJobContext
   9:      17475174      279602784  org.drools.core.time.SelfRemovalJob
  10:      17475174      279602784  org.drools.core.time.impl.PointInTimeTrigger
  11:       9263698      222328752  java.lang.String
  12:       4584671      146709472  java.util.HashMap$Node
  13:        246658      138804176  [B
{noformat}

These number continue to increase over time until the system OOMs.

Graph for # of facts in the session looks like:
 !image-2019-11-25-10-31-07-281.png|thumbnail! 

The engine is fairly busy - we're constantly adding and removing facts.

Our rules are available here:
https://github.com/OpenNMS/opennms/blob/opennms-25.0.0-1/opennms-base-assembly/src/main/filtered/etc/alarmd/drools-rules.d/alarmd.drl#L234




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